Magnetic information media storage with optical servo tracks
US4961123A · kind A · utility
70Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Jun 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59677
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic information storage medium, such as a floppy or rigid magnetic disk having a plurality of indelible grooves inscribed on a surface of the medium to function as optical servo tracks. The grooves can be in the form of a plurality of continuous or noncontinuous concentric circles. The grooves can also be a continuous spiral or a plurality of continuous concentric circles having non-constant widths and/or depths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.